@mixin mobile {
   @media (max-width: 425px) {
       @content;
   }
}
.block {
   &__content {
       position: absolute;
       bottom: 20%;
       left: 10%;
       width: 30%;
       color: white;

       @include mobile {
           bottom: 10%;
           left: 5%;
           width: 80%;
       }
   }
}